WP7 Interesting and usefull links.
As you probably know the MIX10 is currently going on in Vegas and it's presentations are available online which have a lot of very useful information about WP7 development:
https://live.visitmix.com/Videos
Such as:
Building Windows Phone Applications with Silverlight, Part 1
Building Windows Phone Applications with Silverlight, Part 2
Development and Debugging Tools for Building XNA Games for Windows Phone
Silverlight Performance on Windows Phone
Unit Testing Silverlight and Windows Phone Applications
Also, as you know the panoramic control for creating a "hub like" UI is not available yet, but people have already started coming up with thier custom implementations. For example this one:
https://aimeegurl.com/2010/03/18/panoramic-navigation-on-windows-phone-7-with-no-code/